ok my dad has a 68 c10 rebuilt the 283 to stock except for the cam its beefer.has headers now edelbrock intake and carb 1405 i can get it to idle fine in park but once in gear it dies checked for leaks and found none advanced the timing didnt help even double checked the timing still nothing hooked vacuum gauge not even close to what it should be at. last thing i can think of is maybe carb is to big im stumped

ok my dad has a 68 c10 rebuilt the 283 to stock except for the cam its beefer.has headers now edelbrock intake and carb 1405 i can get it to idle fine in park but once in gear it dies checked for leaks and found none advanced the timing didnt help even double checked the timing still nothing hooked vacuum gauge not even close to what it should be at. last thing i can think of is maybe carb is to big im stumped

Did you try adjusting your idle speed screw? And did you check for vacuum leaks?

Set RPM to 800 RPM
Set timing to 12degrees advanced(that is for my truck)
with the vacuum advance disconnected and plugged.
Re attach the vacuum lines.
Then start adjusting the carburetor by screwing the mixture screws in one at a time until you can see the RPM drop 50 to 100 RPM. This makes the mixture "lean". Now adjust the mixture screws out until you achieve the highest RPM as you can for each of the two mixture screws. By this time the engine will be running too high an RPM so adjust the idle speed screw until you achieve the 800 RPM.
I think this will do the trick

Make sure you don't have any vacuum leaks around the intake flange and carburetor base. If you have a long duration camshaft set the initial timing at 16*- 20*. Then you will have to adjust the mechanical timing to make up the difference to 36* at 3000 rpms. What is the camshaft's part number? Another reason the truck will not idle in gear is the torque converter is too tight. Find out the basic operating range of the camshaft. Say the basic operating range is 2000-6000 you will need a 2500-3000 stall converter. Here is an article on setting up the HEI distributor and your timing curve. http://www.crankshaftcoalition.com/w...EI_distributor

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